Peter, I'm using a NavAid wing leveler/AP in my LNC2 and it had the same
problem early on.

I say "had" because the problem was solved by "freezing" the servo's motor
any time the transmit button was depressed. This was done by connecting the
transmit key line (which goes to ground when the button is pushed) via a
diode to an input on the servo that was provided for that purpose. If you're
lucky, there may be something similar on the TruTrak - you might check with
the manufacturer on this. It absolutely solved my problem.

Good luck,

Dan Schaefer